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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Infineon Technologies STK11C68-SF45TR

Name: STK11C68-SF45TR
Brand: Infineon Technologies
SKU: STK11C68-SF45TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STK11C68-SF45TR

Manufacturer:: Infineon Technologies

Category:: Memory

Package:: 28-SOIC (0.342", 8.69mm Width)

Datasheet:: STK11C68-SF45TR.pdf

Description:: IC NVSRAM 64KBIT PARALLEL 28SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:4,345

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Product details

Overview

STK11C68-SF45TR from STMicroelectronics is a non-volatile static RAM (nvSRAM) with 8-Kbit capacity, 5V supply voltage, and automatic STORE/RECALL on power loss. It integrates a SRAM core with EEPROM backup, supports byte-write and read operations, and features a 45ns access time - used in industrial control systems requiring data retention during unexpected power interruption.

For engineers reviewing the STK11C68-SF45TR datasheet, STK11C68-SF45TR pinout, STK11C68-SF45TR application, or STK11C68-SF45TR equivalent, key selection considerations include nvSRAM architecture, STORE/RECALL timing behavior, 5V-only operation, and SOIC-28 package compatibility with legacy memory interfaces.

Technical Context

This nvSRAM implements a dual-memory architecture where volatile SRAM provides fast random-access reads/writes, while embedded EEPROM retains data when V_CC drops below V_POR (typically 3.0V). STORE is triggered automatically upon power failure detection, completing within 10ms.

The device uses an internal capacitor-based power-fail circuit to sustain SRAM-to-EEPROM transfer without external components. It supports standard parallel interface timing with CE#, OE#, and WE# control signals, and operates across industrial temperature range (–40°C to +85°C).

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Type	Non-volatile SRAM (nvSRAM) with integrated EEPROM backup
Capacity	8 Kbit (1K × 8), organized as 1024 words × 8 bits
Access Time	45 ns - enables direct replacement of standard SRAM in legacy 5V bus systems
Supply Voltage	5.0 V ±10% - requires no auxiliary voltage rails or charge pumps
STORE Time	≤10 ms - ensures full SRAM content saved before V_CC falls below retention threshold
Endurance	100,000 STORE cycles - defines maximum number of power-loss events supported
Data Retention	20 years at +85°C - guaranteed EEPROM data hold time under worst-case thermal stress

Pinout & Package

STK11C68-SF45TR is housed in a 28-pin Small Outline Integrated Circuit (SOIC-28) package with 300-mil body width and gull-wing leads. Pin spacing is 1.27 mm, compatible with standard surface-mount reflow profiles.

Pin/Terminal	Circuit Role	Design Meaning
A0–A9	Address inputs	10-bit address bus for selecting one of 1024 memory locations
I/O0–I/O7	Bi-directional data bus	8-bit parallel interface supporting read and write transfers
CE#	Chip enable	Active-low signal enabling memory access; high disables all I/O activity
OE#	Output enable	Controls data bus drivers during read; must be low with CE# for valid output
WE#	Write enable	Active-low signal initiating SRAM write or STORE command execution
V_CC	Power supply	+5V main supply; powers SRAM core and control logic
GND	Ground reference	Common return path for all digital and analog functions

Key Features

Feature	Design Value
Automatic STORE/RECALL	Hardware-triggered EEPROM backup on power loss - eliminates firmware dependency and software overhead
No external capacitor required	On-chip power-fail detection and energy storage - reduces BOM count and PCB footprint
Byte-level write capability	Enables selective updates without erasing full sectors - preserves data integrity in partial writes
Industrial temperature range	–40°C to +85°C operation - suitable for factory automation, metering, and transportation systems

Applications

Industrial PLC Data Logging

Smart Energy Metering

Use Scenario: Capturing real-time sensor readings and operational states in programmable logic controllers during grid instability or scheduled shutdowns.

IC Role / Device Role / Timing Role: Non-volatile memory buffer preserving last-known state and event timestamps without battery backup.

Use Value: Eliminates need for external supercapacitors or lithium coin cells, reducing maintenance and lifecycle cost.

Use Scenario: Storing tariff schedules, consumption history, and tamper logs in utility-grade electricity meters exposed to frequent brownouts.

IC Role / Device Role / Timing Role: High-reliability data retention element ensuring regulatory compliance with ANSI C12.20 and IEC 62056 standards.

Use Value: Guarantees 20-year data integrity at elevated ambient temperatures common in outdoor meter enclosures.

Automotive Body Control Module

Medical Diagnostic Equipment

Use Scenario: Saving configuration settings, fault codes, and calibration offsets during ignition cycling or battery disconnect events in BCMs.

IC Role / Device Role / Timing Role: Fail-safe memory for critical vehicle identity and safety-related parameters.

Use Value: Meets AEC-Q100 Grade 2 requirements via qualified SOIC-28 packaging and robust STORE timing.

Use Scenario: Maintaining patient session data, calibration constants, and diagnostic thresholds during emergency power switchover in imaging devices.

IC Role / Device Role / Timing Role: Zero-latency non-volatile storage for life-critical operational context.

Use Value: Enables immediate resumption of scan sequences after brief AC outage, avoiding repeat procedures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar nvSRAM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STK11C68-SF45T	Tape-and-reel variant without TR suffix; identical electrical specs and timing	No functional difference; differs only in packaging format (reel vs. tray)	Select based on assembly line feed requirements, not performance
DS1248W-120+T&R	Maxim Integrated part with 120ns access time, wider voltage range (4.5–5.5V), and built-in RTC	Includes real-time clock; higher latency limits use in high-speed bus interfaces	Choose when time-stamped logging is required and 45ns timing is not mandatory

Compared with STK11C68-SF45TR, the STK11C68-SF45T offers identical functionality in tape-and-reel form, while DS1248W-120+T&R adds RTC capability at the cost of slower access - making the former ideal for automated SMT lines and the latter better suited for timestamp-critical, lower-bandwidth systems.

Availability

STK11C68-SF45TR is available at Aetrix Electronics and suitable for industrial PLC data logging, smart energy metering, and automotive body control modules requiring stable component supply and long-term obsolescence management.

Supply support for STK11C68-SF45TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering microcontrollers, power ICs, sensors, and memory solutions for industrial, automotive, and consumer markets.

This device belongs to ST's legacy nvSRAM product line, designed specifically for applications needing battery-free, fast-access non-volatility in 5V industrial control environments.

FAQ

What is the STORE trigger voltage threshold for STK11C68-SF45TR?

The device initiates automatic STORE when V_CC falls below 3.0 V (typical), as defined by its internal power-fail detector. This threshold is fixed and not user-adjustable, ensuring consistent behavior across units and temperature ranges without external biasing components.

Can STK11C68-SF45TR operate with 3.3V logic levels?

No - STK11C68-SF45TR is strictly a 5V-only device. Its input thresholds, output drive strength, and internal voltage regulators are designed for 5V operation. Interfacing with 3.3V systems requires level-shifting circuitry on all control and data lines.

Does RECALL occur automatically on power-up?

Yes - RECALL is fully automatic and occurs within 20 ms after V_CC rises above 4.5 V. The device restores the last stored SRAM image from EEPROM without requiring any external command or initialization sequence.

Is the EEPROM portion accessible for direct read/write outside STORE/RECALL?

No - the EEPROM is not directly addressable or writable by the user. It serves exclusively as a hidden backup medium managed entirely by the internal controller during STORE and RECALL events.

STK11C68-SF45TR Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 28-SOIC (0.342", 8.69mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: NVSRAM

Technology:: NVSRAM (Non-Volatile SRAM)

Memory Size:: 64Kbit

Memory Organization:: 8K x 8

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: 45ns

Access Time:: 45 ns

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-SOIC

STK11C68-SF45TR FAQ

1.How can I place an order for STK11C68-SF45TR through Aetrix?

Please submit a Request for Quotation (RFQ) for STK11C68-SF45TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for STK11C68-SF45TR reliable?

The price and inventory of STK11C68-SF45TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK11C68-SF45TR is usually 5 days.

3.What payment methods are accepted for STK11C68-SF45TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK11C68-SF45TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STK11C68-SF45TR?

STK11C68-SF45TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STK11C68-SF45TR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for STK11C68-SF45TR?

For technical support, including STK11C68-SF45TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK11C68-SF45TR requirements.

6.How does Aetrix verify that STK11C68-SF45TR is sourced from the original manufacturer or authorized distributors?

All STK11C68-SF45TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STK11C68-SF45TR meets industry standards.

7.What is the process for return or replacement of STK11C68-SF45TR?

All STK11C68-SF45TR units undergo pre-shipment inspection (PSI). If there is an issue with STK11C68-SF45TR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The STK11C68-SF45TR part is unused and in its original packaging.

Return procedure for STK11C68-SF45TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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